Bristle for a hairbrush



FIG. 1 is a perspective view of a bristle for a hairbrush showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevation view thereof; and,

FIG. 4 is a top plan view thereof. 

CLAIM The ornamental design for a bristle for a hairbrush, as shown and described. 